Reply To: GREP Styles superscript

No, Frutiger font do honour the Superscript/Subscript feature in InDesign. Are the Superscript character style okay, I mean does it have the ‘Superscript’ option selected under the drop-down list for the ‘Position’ under the ‘Basic Character Formats’.

The code should work as I tried it my end and it is working fine.

Secondly, there is no need to create two GREP Styles, instead both the symbols can be clubbed together:
GREP Styles:
Apply Style: SuperScript
To Text: (~d|~r)

Try with some new text in a new file (if still not working) and let us know.